A lender totals the eligible deposits into your business or personal accounts over the review period — most commonly twelve or twenty-four months — and applies an expense factor representing the share of those deposits consumed by running the business. What remains, divided by the number of months, is your monthly qualifying income.
Two inputs drive the outcome: which deposits count, and what factor is applied. Transfers between your own accounts, loan proceeds, and one-time items are typically excluded. The factor is a lender assumption that a CPA letter documenting your actual expense ratio can sometimes replace — which is why two lenders reviewing identical statements can arrive at very different qualifying income.
It is not always the right path. If the property is a rental, a DSCR loan qualifies on the rent and skips your income entirely. If you already own a home and need funds rather than a purchase, the equity structures are usually cheaper than any new first mortgage.